There is a
Features Ideas sub-forum, it used to be called "Feature Requests" once upon a time, many moons ago, but it was renamed as it gave users the mistaken impression that if they requested a feature that something would be done about it when in fact this is very far from the case.
Even if a feature idea is remarkably clever, it still takes someone else to implement it, and for them to do so not only do they also need to agree that the idea has merit, they also need to have the time and skill to implement it.
This doesn't gel terribly well with the way Rockbox developers work. Developers on this project work on what they want to work on, when or if they want to work on it, so often the person who is the prime candidate to implement a new feature is the one who suggested it.
Were you to present a suitable patch that implemented this feature, it would almost certainly be included, but be aware that if you do not you may potentially be waiting indefinitely.
I don't mean this to sound the way it may indeed sound. I know it seems grim.
Simply put, I don't want to instil any false hope in you.
[Saint]